I have been using my friends R15.Here is my observations
Things I liked
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Faster than r15 v2
Less price and abundance of spares.
Looks from the front is ok.
You can have a pillion without breaking his spine.
Awesome power and smoothness
Used bikes are still desirable and can get good price
Things I did not like
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Not very comfortable
Sporty sitting position can induce pain in your hands on long rides
mileage is very less
Rear design is not desirable
maintenance cost is high
You cant do lots of stunt with it as it has overheating sensor
ECU is not optimized as in v2
Even though you have good torque its available at high rpm